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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

thing go
a separate and self-contained entity

part, piece go
a portion of a natural object

body part go
any part of an organism such as an organ or extremity

structure, anatomical structure, complex body part, bodily structure, body structure go
a particular complex anatomical part of a living thing

receptor go
a cellular structure that is postulated to exist in order to mediate between a chemical agent that acts on nervous tissue and the physiological response

beta receptor, beta-adrenergic receptor, beta-adrenoceptor
receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasodilation and increased heart beat)

noun.body

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